Answer
true
Work Step by Step
$A \subseteq B$ if all elements of set A are also elements of set B.
Note that all elements of D are also elements of B.
This means that $D \subseteq B$.
Therefore, the given statement is true.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter R - Review of Basic Concepts - R.1 Sets - R.1 Exercises - Page 8: 53
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